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Birds of prey. Toronto, Ont: Key Porter Books. ISBN 9781550138030. OCLC 37041161. Newman, Kenneth (1999). Kenneth Newman's birds of prey of southern Africa : rulers of the skies : an identification guide to 67 species of southern African raptors. Knysna, South Africa: Korck Pub. ISBN 978-0620245364. OCLC 54470834.
Some birds will respond to a shared song type with a song-type match (i.e. with the same song type). [24] This may be an aggressive signal; however, results are mixed. [23] Birds may also interact using repertoire-matches, wherein a bird responds with a song type that is in its rival's repertoire but is not the song that it is currently singing ...
Birds were used extensively during World War I. One homing pigeon, Cher Ami, was awarded the French Croix de guerre for his heroic service in delivering 12 important messages, despite having been very badly injured. [41] During World War II, the Irish Paddy, the American G.I. Joe and the English Mary of Exeter all received the Dickin Medal ...
The intelligent birds recognize and react to numbers in a process similar to that of human cognition, according to a new study. ... they would peck at an “enter” key on the touchscreen that ...
Birds of prey such as honey buzzards which migrate using thermals lose only 10 to 20% of their weight during migration, which may explain why they forage less during migration than do smaller birds of prey with more active flight such as falcons, hawks and harriers. [67]
The blue jay can be beneficial to other bird species, as it may chase predatory birds, such as hawks and owls, and will scream if it sees a predator within its territory. It has also been known to sound an alarm call when hawks or other dangers are near, and smaller birds often recognize this call and hide themselves away accordingly.
The successful and now widespread captive breeding of birds of prey began as a response to dwindling wild populations due to persistent toxins such as PCBs and DDT, systematic persecution as undesirable predators, habitat loss, and the resulting limited availability of popular species for falconry, particularly the peregrine falcon. The first ...
How do birds get their colors? Understanding bird coloration combines biology and physics. There are two primary ways that birds get their color: pigmentation and the physical structure of the ...